In the laboratory, hot-wire anemometers can be used to measure outside wind speed, air velocity, and temperature in hoods and enclosures, and slight gas movement in ductwork. The wire is cooled by the air flow and the known resistance of the metal is used to calculate the flow speed.Īlthough somewhat delicate, hot wire anemometers are used to study turbulent or rapid velocity fluctuation flows. Hot wire anemometers use an electrically heated wire to help calculate air speed. The fan speed is measured by a revolutions counter and converted to a wind speed measurement.ĭigital vane thermoanemometers may be pre-calibrated, traceable to NIST, and offer a choice of measurement units (ft./min., m/s, mph, km/hr., knots, CFM, and CMM). The axis of a vane anemometer is parallel to the wind direction (horizontal). Vane anemometers are mechanical velocity instruments, often described as windmills or propellers. Anemometers to measure the speed of wind or a gas stream, and flowmeters to measure the flow rate of a liquid or gas available in a variety of configurations.
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